[kiwiokie]

Having just done this on my '83 SC here is what I would recommend:
1. Drain the tank, remove strainer and flush.
2. Remove fuel level sender tube and clean up rust particles that accumulate around connections.
3. Replace fuel filler hose (it dries out and cracks on the underside that you cannot see)
4. Install new strainer and gasket
5. Replace short hose from tank to pump
6. Replace fuel pump check valve. Be careful not to allow pump to rotate when breaking connections as your output hose is probably as hard as rock and will split easily.
7. Replace fuel filter
8. Remove accumulator and flush
9. Remove fuel input line to WUR and clean out fine metal mesh filter (mine had 1/4" of rusty particles)
10. Clean around sensor plate and lubricate hinge if necessary so action is smooth
11. Refill tank and then check pressures with CIS gauges

I initially tried step 11 first and my readings were way off because of issues upstream. Steps 1 through 10 give a good base for your readings. Good luck. Not real hard stuff but a little time consuming.